Thin noodles are tossed in deeply caramelized scallion oil with a splash of soy sauce for aromatic simplicity. This vegetarian Shanghai family staple proves that the fewest ingredients can yield the most memorable flavors.
Trim and thinly slice the scallions, separating whites and greens. Pat them dry to minimize splattering when frying.
Heat the neutral oil in a large skillet over medium heat. Add scallion whites and fry, stirring frequently, for 8–10 minutes until deeply golden and fragrant.
Lower the heat and add scallion greens. Continue frying until both whites and greens are crispy but not burnt, about 2–3 more minutes. Remove from heat.
Meanwhile, boil the thin wheat noodles according to package directions just until al dente, then drain well—do not overcook to preserve a pleasing chew.
While noodles are hot, toss with scallion oil (spooning out both oil and crispy scallions), soy sauce, dark soy sauce, sugar, and salt. Mix thoroughly so every strand is glossy and coated before serving.